Smoke simulation not compliant with Emitter scale
I had this same problem, I don't know if this will still help you...but if you click on the UV-sphere or your emitter there will be a setting in the physics tab called Flow Source. Click on the drop down arrow and it will open up these settings. You are going to want to play around with Surface Emission (BTW I am using blender 2.91). The smaller the value the closer the smoke will be, the larger the number the farther away the smoke will be. Hope this helps you or anyone else checking this forum.